* {
    padding: 0;
    margin: 0;
}


.box {
    display: flex;
    width: 5rem;
    height: 8rem;
    border: 0.02rem solid red;

    > div {
        flex-wrap: wrap;
        width: 2rem;
        height: 2rem;
        background: orange;
        border: 0.02rem solid blue;
    }
}

